| 摘要 |
PURPOSE:To obtain a titled circuit that can prevent the malfunction of a sequence circuit without disturbing the normal output of the sequence circuit in any fault mode, by setting an overcurrent preventing resistance, etc. between the output terminal of the sequence circuit and a sequence output terminal. CONSTITUTION:An overcurrent preventing resistance, etc. is set between the output terminal of a sequence circuit and a sequence output terminal. As a result, the malfunction of the sequence circuit can be prevented without disturbing the normal output of the sequence circuit. For instance, an input IN is supplied to a sequence circuit 1. At the same time, a resistance 5 that suppresses the upstable working due to the cutoff current of the collector with the connection of a low-level power supply to the emitter is supplied to the base of an NPN transistor 4 inserted between the emitter and the base through an overcurrent limiting resistance 3. Then the output of the circuit 1 is transmitted to an output terminal 6 through an overcurrent preventing resistance 7, and at the same time the collector output is delivered to the terminal 6 by the transistor 4. Thus the malfunction of the circuit 6 is prevented from emerging at the terminal 6. |
